Thank you for your question!
Yes, I have felt like that, many, many times.
It mostly happens after a relationship has ended and there's that awkward time when you pass them in the hallway or see them with someone else, it makes you sick and humiliated, but you also get those butterflies that you used to get when you were with them because you're so used to getting happy when you see them that it's hard when they just walk by and don't say anything. It's a really terrible and confusing feeling, heart breaking really. The best thing that you can do is to try not to be around them as much as possible, avoid them, don't make eye contact. Keep yourself away from them, don't torture yourself.
If you have any other questions let me know, if you're having a problem I could try and help you :)